**Acknowledgement**

The present work has been conducted with research permission from DINARA-MGAP at Isla de Lobos and Cabo Polonio. We are extremely grateful to the fur seal keepers Leonardo Olivera, Nelson Veiga, Miguel Casella and César Barreiro who helped us to work with the animals at Isla de Lobos; Lic. Oscar Castro, Dr. Gustavo de Souza, Dra. Graciela Pedrana, Dr. Antonio Moraña, Dr. Francisco Gutiérrez, MSc. Valentina Franco and Dr. Federico Riet, who helped during field work and contributed with bibliography that enriched the present article. We thank Dr. Riet for the figure showing pinniped colonies distribution.
